From d091a118761338a4de75e0f8f1678bf4947440f0 Mon Sep 17 00:00:00 2001
From: abhi-0203 <abhi-0203@users.noreply.github.com>
Date: Sat, 22 Aug 2026 04:34:05 +0000
Subject: [PATCH] fix: use identity check for None instead of equality in
 ascii_tree

---
 src/ssvc/decision_tables/helpers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ssvc/decision_tables/helpers.py b/src/ssvc/decision_tables/helpers.py
index 4326236e9..64658de0a 100644
--- a/src/ssvc/decision_tables/helpers.py
+++ b/src/ssvc/decision_tables/helpers.py
@@ -377,7 +377,7 @@ def ascii_tree(dt: DecisionTable, df: pd.DataFrame | None = None) -> str:
     Reads a Pandas data frame, builds a decision tree, and returns its ASCII representation.
     """
     # Check for the optional 'row' column and drop it if it exists.
-    if df == None:
+    if df is None:
         df = decision_table_to_longform_df(dt)
 
     if "row" in df.columns: